管子受热时就会膨胀。把管子安装成弯曲或循环状便于其膨胀。
When a pipe is heated the pipe expands. Bends or loops are installed to allow for expansion.
他们也许会发现，除了可以发出那个短促的响声外，在玩具的一个管子里还有一个电灯按钮，一个可以播放音乐的键区，以及安装在一个管道内的换向镜。
They might discover that, as well as the squeaker, the toy had a button inside one tube which activated a light, a keypad that played musical notes, and an inverting mirror inside one of the tubes.
上面的盆子装满土并在底部安装向下渗透养分的管子。
The first basin would be filled with soil and a drain would be located at the bottom to allow leach of nutrients.
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